07-08-2009, 03:08 PM
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#11 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3595
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Quote:
Originally Posted by DDMotorsports
Just ordered an Unorthodox Racing stock diameter crank pulley! According to them, this will shed 7 lbs. of rotating mass off of the front of the car
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Quote:
Originally Posted by DDMotorsports
Yeah it does also have effect but if its also heavier than the UR one then it will be a wash. Even if they weigh the same, I would guess that it will make 1whp difference max, or less. You will gain more from less weight than less parasitic drag. Like I said, we'll see once I put the UR pulley on my car. I personally prefer to use a stock diameter pulley to maintain factory accessory outputs from the alternator, power steering, etc.
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Stillen quotes the stock pulley at 4.72 lbs. My bathroom scale, while not very accurate or repeatable unfortunately, agrees that my stock pulley is somewhere in the vicinty of 4.5-5-ish lbs. So there's no way it's shaving off 7lbs 
It will be interesting to get the Unorthodox one weighed though so we can compare. Stillen's showing 1.32 lbs for their standard-sized one and 0.99 lbs for their underdriven model, but I don't know if anyone's tried to accurately verify those numbers.
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